Minor fix to ipv6 detection for inventory with -i

For link-local addresses, it is sometimes necessary to append the
interface to use for the ipv6 address. This patch extends the ipv6
regex to allow for '%ifnameX' at the end.

See https://bugzilla.redhat.com/show_bug.cgi?id=136852 for more info

lib/ansible/inventory/__init__.py

@@ -74,7 +74,7 @@ class Inventory(object):
             self.parser = None
             all = Group('all')
             self.groups = [ all ]
-            ipv6_re = re.compile('\[([a-f:A-F0-9]*)\](?::(\d+))?')
+            ipv6_re = re.compile('\[([a-f:A-F0-9]*[%[0-z]+]?)\](?::(\d+))?')
             for x in host_list:
                 m = ipv6_re.match(x)
                 if m: